View Full Version : tbi or tpi pump replacement?
04-26-2010, 02:53 PM
mine finally decided to quit... i was having issues with idling at long stop lights, idle started falling slowly till the point where it wanted to die.. i had thought it was a percolating issue so i went and got a moroso 1/2 phenolic spacer and of course as soon as i threw it on the fuel pump died lol. should have trusted my guage when it would drop and as soon as i hit the throttle it would go back up so i figured the gauge was giving me inaccurate reading, but now it won't start and bowls are dry... pump won't even turn on
so anyways would i see any advantage to running a tpi pump over the tbi unit? running through a mallory 4309 regulator
04-26-2010, 03:14 PM
i would say no if you are running a carb
04-26-2010, 07:34 PM
use a tbi pump. carb likes its psi at a certain level ie 6-8psi. tpi pump is not needed.
04-26-2010, 08:45 PM
alright sounds good
my old pump at start up, pressure gauge would read 9-10 psi- and after the pump warmed up (only thing i could guess) it would drop down to 4-5 psi...so i ended up having to live with the high pressure at start up never caused any real problems but hopefully that was just a sign of my pump on its way out.
04-27-2010, 07:52 PM
well that was a nice waste of a day....still no fuel pressure, pump won't run, only kicks on for a few seconds then nothing.
i'm trying to find the wiring diagrams to see what else may cut the power to it, heard the oil pressure switch may do something to it not sure what else does.
04-27-2010, 07:53 PM
edit: double post
Bad Bowtie 91
04-28-2010, 04:00 AM
Mine did the same thing a few weeks ago, would start up fine, idle for like a minute then die, check the carb and bowls were empty.
I replaced in order, Fuel pump relay, oil pressure sending unit, carb, and fuel pump. Nothing worked, so I ran a wire from the battery to the pump and it fired up and ran great.
Turns out, I had a chaffed wire going back to the pump, cut out the original power wire and heat shrinked a new power wire and she's been runnin like a champ since.
I found out that the oil pressure sending unit can be unplugged and it still run, someone else told me it will still run without it so I unhooked it and tried it, ran great.
Hope you get he back on the road soon, good luck
04-28-2010, 05:15 PM
turns out my oil pressure sending unit was bad, came apart when i tried to unplug it :LOL: had another from scrap engine threw it in and works again...probably was due for a new pump anyway oh well
04-28-2010, 05:18 PM
how much psi can the tpi pump put out?
04-28-2010, 05:20 PM
60 psi, i believe...i was more interested in the volume it put out, not the pressure
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